VIEWS: 3 PAGES: 7 CATEGORY: Electricity POSTED ON: 5/30/2010
1. Field of the InventionThe present invention relates to a magnetic resonance imaging (MRI) system and method for exciting magnetic resonance in a specific portion of an object to be examined, which is placed in a static magnetic field, by applying a gradient magneticfield and high-frequency pulses (RF pulse) of a 90.degree. pulse-180.degree. pulse sequence to the object, acquiring spin echo signals induced by the magnetic resonance, and imaging the specific portion by using the spin echo signal data in accordancewith a predetermined image reconstruction method.2. Description of the Related ArtIn a general medical MRI system, a gradient magnetic field and a high-frequency pulse are applied to an object to be examined, which is placed in a static magnetic field, in accordance with a predetermined sequence for magnetic resonance (MR)excitation/magnetic resonance (MR) data acquisition. As a result, an MR phenomenon occurs in a specific portion of the object. An MR signal induced by the MR phenomenon is detected. When acquired MR data is subjected to imaging data processingincluding image reconstruction, the anatomical data or quality data of the specific portion of the object is imaged.A conventional MRI system of this type generally comprises a static field generator, X-, Y-, and Z-axis gradient field generators, and high-frequency transmitter and receiver. When the X-, Y-, and Z-axis gradient field generators and thehigh-frequency transmitter are driven in accordance with a predetermined sequence, X-, Y-, and Z-axis gradient fields Gx, Gy, and Gz, and a high-frequency pulse are generated. As a result, MR is excited and an MR signal is generated. The MR signal isreceived by the receiver. The reception data is then subjected to predetermined image processing including image reconstruction. The tomographic image of a certain slice portion of an object to be examined is generated in this manner, and is displayedon a monitor.In an excitation sequence of MR, t
"Magnetic Resonance Imaging System And Method - Patent 4950992"